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author | PostgreSQL Daemon <webmaster@postgresql.org> | 2004-01-19 20:07:14 +0000 |
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committer | PostgreSQL Daemon <webmaster@postgresql.org> | 2004-01-19 20:07:14 +0000 |
commit | 2a9bf5b33d0b82e9f483f6a5ced9d71e1c009441 (patch) | |
tree | 8c0c38494985b8dbfd2311b5be51fa76a271ba17 /src/interfaces/jdbc/example/basic.java | |
parent | 9bd681a5220186230e0ea0f718a71af7ebe4b560 (diff) | |
download | postgresql-2a9bf5b33d0b82e9f483f6a5ced9d71e1c009441.tar.gz postgresql-2a9bf5b33d0b82e9f483f6a5ced9d71e1c009441.zip |
JDBC is now on GBorg
Diffstat (limited to 'src/interfaces/jdbc/example/basic.java')
-rw-r--r-- | src/interfaces/jdbc/example/basic.java | 219 |
1 files changed, 0 insertions, 219 deletions
diff --git a/src/interfaces/jdbc/example/basic.java b/src/interfaces/jdbc/example/basic.java deleted file mode 100644 index d1a7e602941..00000000000 --- a/src/interfaces/jdbc/example/basic.java +++ /dev/null @@ -1,219 +0,0 @@ -package example; - -import java.io.*; -import java.sql.*; - -/* - * - * $PostgreSQL: pgsql/src/interfaces/jdbc/example/basic.java,v 1.15 2003/11/29 22:41:19 pgsql Exp $ - * - * This example tests the basic components of the JDBC driver, and shows - * how even the simplest of queries can be implemented. - * - * To use this example, you need a database to be in existence. This example - * will create a table called basic. - * - * Note: This will only work with post 7.0 drivers. - * - */ - -public class basic -{ - Connection db; // The connection to the database - Statement st; // Our statement to run queries with - - public basic(String args[]) throws ClassNotFoundException, FileNotFoundException, IOException, SQLException - { - String url = args[0]; - String usr = args[1]; - String pwd = args[2]; - - // Load the driver - Class.forName("org.postgresql.Driver"); - - // Connect to database - System.out.println("Connecting to Database URL = " + url); - db = DriverManager.getConnection(url, usr, pwd); - - System.out.println("Connected...Now creating a statement"); - st = db.createStatement(); - - // Clean up the database (in case we failed earlier) then initialise - cleanup(); - - // Now run tests using JDBC methods - doexample(); - - // Clean up the database - cleanup(); - - // Finally close the database - System.out.println("Now closing the connection"); - st.close(); - db.close(); - - //throw postgresql.Driver.notImplemented(); - } - - /* - * This drops the table (if it existed). No errors are reported. - */ - public void cleanup() - { - try - { - st.executeUpdate("drop table basic"); - } - catch (Exception ex) - { - // We ignore any errors here - } - } - - /* - * This performs the example - */ - public void doexample() throws SQLException - { - System.out.println("\nRunning tests:"); - - // First we need a table to store data in - st.executeUpdate("create table basic (a int2, b int2)"); - - // Now insert some data, using the Statement - st.executeUpdate("insert into basic values (1,1)"); - st.executeUpdate("insert into basic values (2,1)"); - st.executeUpdate("insert into basic values (3,1)"); - - // This shows how to get the oid of a just inserted row - st.executeUpdate("insert into basic values (4,1)"); - long insertedOID = ((org.postgresql.PGStatement)st).getLastOID(); - System.out.println("Inserted row with oid " + insertedOID); - - // Now change the value of b from 1 to 8 - st.executeUpdate("update basic set b=8"); - System.out.println("Updated " + st.getUpdateCount() + " rows"); - - // Now delete 2 rows - st.executeUpdate("delete from basic where a<3"); - System.out.println("deleted " + st.getUpdateCount() + " rows"); - - // For large inserts, a PreparedStatement is more efficient, because it - // supports the idea of precompiling the SQL statement, and to store - // directly, a Java object into any column. PostgreSQL doesnt support - // precompiling, but does support setting a column to the value of a - // Java object (like Date, String, etc). - // - // Also, this is the only way of writing dates in a datestyle independent - // manner. (DateStyles are PostgreSQL's way of handling different methods - // of representing dates in the Date data type.) - PreparedStatement ps = db.prepareStatement("insert into basic values (?,?)"); - for (int i = 2;i < 5;i++) - { - ps.setInt(1, 4); // "column a" = 5 - ps.setInt(2, i); // "column b" = i - ps.executeUpdate(); // executeUpdate because insert returns no data - } - ps.close(); // Always close when we are done with it - - // Finally perform a query on the table - System.out.println("performing a query"); - ResultSet rs = st.executeQuery("select a, b from basic"); - if (rs != null) - { - // Now we run through the result set, printing out the result. - // Note, we must call .next() before attempting to read any results - while (rs.next()) - { - int a = rs.getInt("a"); // This shows how to get the value by name - int b = rs.getInt(2); // This shows how to get the value by column - System.out.println(" a=" + a + " b=" + b); - } - rs.close(); // again, you must close the result when done - } - - // Now run the query again, showing a more efficient way of getting the - // result if you don't know what column number a value is in - - - - System.out.println("performing another query"); - rs = st.executeQuery("select * from basic where b>1"); - if (rs != null) - { - // First find out the column numbers. - // - // It's best to do this here, as calling the methods with the column - // numbers actually performs this call each time they are called. This - // really speeds things up on large queries. - // - int col_a = rs.findColumn("a"); - int col_b = rs.findColumn("b"); - - // Now we run through the result set, printing out the result. - // Again, we must call .next() before attempting to read any results - while (rs.next()) - { - int a = rs.getInt(col_a); // This shows how to get the value by name - int b = rs.getInt(col_b); // This shows how to get the value by column - System.out.println(" a=" + a + " b=" + b); - } - rs.close(); // again, you must close the result when done - } - - // Now test maxrows by setting it to 3 rows - - - - st.setMaxRows(3); - System.out.println("performing a query limited to " + st.getMaxRows()); - rs = st.executeQuery("select a, b from basic"); - while (rs.next()) - { - int a = rs.getInt("a"); // This shows how to get the value by name - int b = rs.getInt(2); // This shows how to get the value by column - System.out.println(" a=" + a + " b=" + b); - } - rs.close(); // again, you must close the result when done - - // The last thing to do is to drop the table. This is done in the - // cleanup() method. - } - - /* - * Display some instructions on how to run the example - */ - public static void instructions() - { - System.out.println("\nThis example tests the basic components of the JDBC driver, demonstrating\nhow to build simple queries in java.\n"); - System.out.println("Useage:\n java example.basic jdbc:postgresql:database user password [debug]\n\nThe debug field can be anything. It's presence will enable DriverManager's\ndebug trace. Unless you want to see screens of items, don't put anything in\nhere."); - System.exit(1); - } - - /* - * This little lot starts the test - */ - public static void main(String args[]) - { - System.out.println("PostgreSQL basic test v6.3 rev 1\n"); - - if (args.length < 3) - instructions(); - - // This line outputs debug information to stderr. To enable this, simply - // add an extra parameter to the command line - if (args.length > 3) - DriverManager.setLogStream(System.err); - - // Now run the tests - try - { - basic test = new basic(args); - } - catch (Exception ex) - { - System.err.println("Exception caught.\n" + ex); - ex.printStackTrace(); - } - } -} |